/Engine/Source/Editor/SceneOutliner/Public/SSceneOutliner.h
Validate a drag drop operation on a drop target
[FSceneOutlinerDragValidationInfo](API\Editor\SceneOutliner\FSceneOutlinerDragValidationInfo) ValidateDrop ( const [ISceneOutlinerTreeItem](API\Editor\SceneOutliner\ISceneOutlinerTreeItem) & DropTarget, const [FSceneOutlinerDragDropPayload](API\Editor\SceneOutliner\FSceneOutlinerDragDropPayload) & Payload ) const